过第一焦点（前焦点或物方焦点）且垂直于系统主光轴的平面称第一焦平面，又称前焦面或物方焦面。
这意味着，在焦平面被移动的情况下，仍可以确定光线的方向。
This in turn means that it is possible to determine where the ray would strike if the focal plane were moved.
公司已经收集了试验模式图像用于望远镜成像质量和焦平面功能。
The company already has collected test pattern images that demonstrate telescope image quality and focal plane functionality.
在传统相机上以胶卷作为焦平面；现代相机使用数字传感器列阵的方式。
In traditional cameras the focal plane was a piece of film; modern ones use arrays of digital sensors.
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